An extension class using ExtensionOf attribute can not extend another extension class not using the ExtensionOf attribute

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Posted on by Grzegorz Wawrzeniecki

Hello

How can I fix the following issue? Is it possible at all?

LedgerJournalTrans_PL_Extension class is an original class from Application Suite.

D365 Version: Installed platform version : Update50 (7.0.6354.93)

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nunomaia 25 Moderator on at

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You should extend base class and not the extension. What are you trying to get ?

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Grzegorz Wawrzeniecki on at

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Thx for your reply!

I am extending the base class.

I don't know what the reason for naming it Extension is

I want to extend with CoC one method from that class.

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Martin Dráb 237,965 Most Valuable Professional on at

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The reason why the class name is suffixed with _Extention is that the class contains extension methods. For example, the first method is called calcUserTaxBase_PL() and if you look at references, you'll find that it's called as if it was a method of LedgerJournalTrans table:

ledgerJournalTrans.calcUserTaxBase_PL();

These days, we use ExtensionOf attribute on a class and a simpler syntax to define extensin methods, but this is how it was done before ExtensionOf attribute was introduced - and it still can be used. But, as you see, extensions of these classes don't seem to be supported,

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Grzegorz Wawrzeniecki on at

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Thx for your reply!

Okay, now I finally understand it.

Since the extension of these classes doesn't seem to be supported, is there any way to achieve my needs?

I see that this extension method is called in LedgerJournalEngine class.

But the parameter isn't passed to the method

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Martin Dráb 237,965 Most Valuable Professional on at

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That's correct - the parameter isn't passed to the method, because it's called as if it was an instance method of _ledgerJournalTrans. You write code

_ledgerJournalTrans.initFromCustVendVatRegNums_PL()

but the code generated by compiler is actually this:

LedgerJournalTrans_PL_Extension::initFromCustVendVatRegNums_PL(_ledgerJournalTrans).

The first parameter is used to identify the current object, which is actually done by the left part of this expression:

_ledgerJournalTrans.initFromCustVendVatRegNums_PL()

Therefore the first parameter isn't included in parameters that you can specify when calling the method.

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